docs: def remove_renderer(self, rend):
          '''Remove a renderer from the current view.
          
          **Example**
          
          ::
  
              rend = v.add_renderer(AtomRenderer)
              v.remove_renderer(rend)
  
          .. versionadded:: 0.3
          '''
          if rend in self.widget.renderers:
              self.widget.renderers.remove(rend)
          else:
              raise Exception("The renderer is not in this viewer")